Invention Grant
- Patent Title: Circuit and method for driving LEDs
- Patent Title (中): LED驱动电路及方法
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Application No.: US13607266Application Date: 2012-09-07
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Publication No.: US08803445B2Publication Date: 2014-08-12
- Inventor: Bernd Pflaum
- Applicant: Bernd Pflaum
- Applicant Address: AT Villach
- Assignee: Infineon Technologies Austria AG
- Current Assignee: Infineon Technologies Austria AG
- Current Assignee Address: AT Villach
- Agency: Slater & Matsil, L.L.P.
- Main IPC: H05B37/02
- IPC: H05B37/02

Abstract:
A circuit for driving light emitting diodes includes a first semiconductor switch that is responsive to a driver signal and a freewheeling device coupled between a first supply terminal that provides a supply voltage and a second supply terminal that provides a reference potential. An LED and an inductor are coupled in series between a common circuit node of the first semiconductor switch and the freewheeling device and either the first supply terminal or the second supply terminal. A current measurement circuit is coupled to the LED and provides a load current signal that represents a load current passing through the at least one LED. A first feedback circuit includes an on-off controller that receives load current signal and a reference signal, compares the load current signal with the reference signal and generates the driver signal dependent on the comparison.
Public/Granted literature
- US20140070728A1 Circuit and Method for Driving LEDs Public/Granted day:2014-03-13
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